1foam 
/ˈfoʊm/ noun
/ˈfoʊm/ noun [noncount] 1 : a mass of small bubbles that are formed in or on a liquid
▪ As I poured the beer, foam bubbled up in the glass. 2 : a substance that is like a thick liquid made of many small bubbles
▪ The fire extinguisher is filled with foam. ▪ a can of shaving foam 3 : a soft material that is used to make many products : foam rubber — often used before another noun ▪ a foam mattress/pillow
▪ As I poured the beer, foam bubbled up in the glass.
▪ The fire extinguisher is filled with foam. ▪ a can of shaving foam
— foam·i·ness /ˈfoʊminəs/ noun [noncount]
/ˈfoʊminəs/ noun [noncount]— foamy /ˈfoʊmi/ adjective, foam·i·er; foam·i·est
▪ a foamy glass of beer
/ˈfoʊmi/ adjective, foam·i·er; foam·i·est ▪ a foamy glass of beer
